Green’s Dictionary of Slang

Jackie Robinson n.

[proper name of Jackie Robinson (1919–72), who in 1947 became the first black man to play in major league baseball (for the Brooklyn Dodgers)]
(US black)

1. any black person who is the first to gain entry to a profession.

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[US]C. Major Juba to Jive.

2. the penis [note Jack Robinson n.].

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[US]C. Major Juba to Jive.